Datasheet > ELM325SM

ELM325SM

更新时间： 2024-02-26 08:38:57

品牌	Logo	应用领域
ELM		/
页数	文件大小	规格书
31页	181K
描述
J1708 Interpreter

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数据手册

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ELM325SM 数据手册

ELM325

J1708 Interpreter

Description

Features

With the advent of electronic engine controls,

• Supports both SAE J1587 and J1922

• High speed RS232 interface

many vehicles also adopted some form of diagnostic

tools to help monitor their operation. As more

modules began to be used in vehicles, there was

also a need for the devices to share information

rather than each independently obtain this from

separate sensors.

• Works with standard RS485 transceivers

• Fully configurable with AT commands

• Wide operating voltage range (1.8 to 5.5V)

• Low power CMOS design

In the 1980’s, the SAE J1708 standard was

created to provide a specification for a common data

bus to be used in heavy duty vehicles. It used

RS485 wiring (already proven to be reliable in noisy

environments), and a UART-based low speed data

format. The SAE J1587 standard followed a few

years later to describe the mechanism by which

messages and data should be sent between vehicle

modules.

Connection Diagram

PDIP and SOIC

(top view)

VDD

XT1

VSS

The ELM325 allows a PC or similar device to be

used to monitor and query devices on a J1708 data

bus, using simple commands that can be sent from

almost any terminal program. It is able to work with

either the J1587 or the J1922 data formats.

XT2

InvDE

RS232 Rx

RS232 Tx

RS Rx LED

J Tx LED

J Rx LED

RS Tx LED

Applications

• Diagnostic trouble code readers

• Heavy duty vehicle scan tools

• Teaching aids

• ECU Simulators

3.58 MHz

Block Diagram

InvDE

XT1

XT2

Timing and

Control

RS232 Rx

RS232 Tx

RS232

Interface

J1708

Interface

J1587/1922

Interpreter

RS Rx LED

RS Tx LED

J Tx LED

J Rx LED

ELM325DSA

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